                                                              :exhibitor-s3-bucket (exhibitor-bucket-name cluster-name)
                                                              :internal-lb-dns (output-of "aws_elb" "InternalMasterLoadBalancer" "dns_name")
                                                              :fallback-dns (vpc/fallback-dns vpc/vpc-cidr-block)})
-                   :ebs_block_device {:device_name "/dev/xvda" :volume_size 20}
+                   :root_block_device {:volume_size 20}
                    :max_size 3
                    :min_size 1
                    :health_check_type "ELB"

                                                      :internal-lb-dns (output-of "aws_elb" "InternalMasterLoadBalancer" "dns_name")
                                                      :fallback-dns (vpc/fallback-dns vpc/vpc-cidr-block)})

                   :ebs_block_device {:device_name "/dev/xvda" :volume_size 20}
                   :max_size 3
                   :min_size 3
                   :health_check_type "EC2" ;; or "ELB"?

                   :min_size 3
                   :health_check_type "ELB"
                   :health_check_grace_period 20
                   :root_block_device {:volume_size 20}
                   :subnets public-subnets
                   :elb {:health_check {:healthy_threshold 2
                                        :unhealthy_threshold 3
